chore: import upstream snapshot with attribution

examples/stories/json_response/server_lowlevel.py

@@ -0,0 +1,44 @@
+"""Serve over Streamable HTTP with JSON responses (lowlevel API)."""
+
+from typing import Any
+
+import mcp_types as types
+from starlette.applications import Starlette
+
+from mcp.server.context import ServerRequestContext
+from mcp.server.lowlevel import Server
+from stories._hosting import NO_DNS_REBIND, run_app_from_args
+
+GREET_INPUT_SCHEMA: dict[str, Any] = {
+    "type": "object",
+    "properties": {"name": {"type": "string"}},
+    "required": ["name"],
+}
+
+
+def build_app() -> Starlette:
+    async def list_tools(
+        ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
+    ) -> types.ListToolsResult:
+        return types.ListToolsResult(
+            tools=[
+                types.Tool(
+                    name="greet",
+                    description="Report progress mid-call, then return a greeting.",
+                    input_schema=GREET_INPUT_SCHEMA,
+                )
+            ]
+        )
+
+    async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
+        assert params.name == "greet" and params.arguments is not None
+        await ctx.session.report_progress(0.5, total=1.0, message="halfway")
+        text = f"Hello, {params.arguments['name']}!"
+        return types.CallToolResult(content=[types.TextContent(text=text)], structured_content={"result": text})
+
+    server = Server("json-response-example", on_list_tools=list_tools, on_call_tool=call_tool)
+    return server.streamable_http_app(json_response=True, transport_security=NO_DNS_REBIND)
+
+
+if __name__ == "__main__":
+    run_app_from_args(build_app)